yesterday意思为:n.昨天;不久前;近日,日前,不久以前;往昔
adv.在昨天;日前,前不久
例句:
1、Yesterday's students are today's employees.
昨天还是学生,今天成了雇员。
2、I took a half day off yesterday.
昨天我休假半天。
3、Unless I'm mistaken, she was back at work yesterday.
除非是我记错了,她是昨天回来上班的。
4、They left the day before yesterday.
他们前天就走了。